Admiral Hal Gehman.

Admiral Hal Gehman.

JOE BURBANK/ORLANDO SENTINEL

With a mock-up of the shuttle, in foreground, Admiral Hal Gehman, chairman of the Columbia Accident Investigation Board, talks about the final Columbia report, released Tuesday, at the National Transportation Safety Board conference room in Washington D.C.

With a mock-up of the shuttle, in foreground, Admiral Hal Gehman, chairman of the Columbia Accident Investigation Board, talks about the final Columbia report, released Tuesday, at the National Transportation Safety Board conference room in Washington D.C. (JOE BURBANK/ORLANDO SENTINEL)

With a mock-up of the shuttle, in foreground, Admiral Hal Gehman, chairman of the Columbia Accident Investigation Board, talks about the final Columbia report, released Tuesday, at the National Transportation Safety Board conference room in Washington D.C.